River and confluence response to the construction and failure of Balin Dam, 1977-2008
Date Issued
2009
Date
2009
Author(s)
Wu, Yu-Hua
Abstract
River response to the construction and failure of a dam is examined in the present thesis using a combination of laboratory experiments and field data. The field case considered is the Balin check dam, constructed in 1977 across the upper TaHan River, which failed in 2007 during Typhoon Wipha. A special characteristic of Balin Dam is that it is located less then 2 km downstream of an important confluence, the junction of SanGuang River with TaHan River. To understand the river and confluence evolution from 1977 to 2008, we collected field data from various sources and carried out a new survey of the river and terrace profiles in December 2008. The comparison of historic and newly surveyed data before and after the dam breach documents a severe incision of accumulated deposits upstream of the dam, moderate aggradation downstream, and a dramatic incision and downstream migration of the confluence junction. It is found that these key features of the river and confluence response can be reproduced by simple small- scale laboratory experiments.
Subjects
river response
Balin check dam
survey
dam breach
incision
aggradation
migration
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96521309-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):9579b37a77e5d3ebc3a074e0e821827f